Add uniform fog to the viewport.

The density of the uniform fog.

An opacity modifier on the uniform fog to quickly dial the effect up or down.

The color of the uniform fog.

Where the fog begins and ends, in world units from the camera. For Uniform fog, the depth values are clamped to these depths. Nearer the fog start there will be no fog, and farther end the fog will hold at that maximum fog value.

The maximum distance that uniform fog is applied. Objects farther than this have no fog applied. This is useful for avoiding fog on background plates.

• off – Fog is applied evenly regardless of height.

• above – Fog is only applied above the Fog Height. This simulates a layer of cloud.

• below – Fog is only applied below the Fog Height. This simulates ground fog.

The cutoff point for fog, in world units, when Fog Height Mode is set to above or below.

A gradual falloff for fog so the transition between fog and no fog is not as sharp. This is in world units, and affects the fogged area so that at Fog Height there will be no fog. For example, in above mode, the fog density will gradually increase from zero at Fog Height, to Fog Density at Fog Height + Fog Height Falloff.

Use a directional light in the scene to do simple lighting when in Uniform mode. The direction and color of the light is used to blend between the fog and light colors. The Fog Sun Intensity adjusts the intensity of sun effect.

Adjust the extent of the sun’s lighting on uniform fog. Larger values will produce a larger bloom in the direction of the sun, similar to adjusting the roughness on a material. This only affects Uniform fog.

Multiply the distant light intensity by this value if Fog Sun is enabled.

Add volumetric fog to the viewport. This requires lights in the scene to illuminate the fog.

The density of the volumetric fog.

An opacity modifier on the volumetric fog to quickly dial the effect up or down.

The color of the volumetric fog.

For the Volumetric fog, this range defines where the fog is lit, in world units from the camera. Outside this range no fog effect occurs, so it should tightly bound the lights with Fog Scattering. Making this too large will make the fog look blocky.

• off – Fog is applied evenly regardless of height.

• above – Fog is only applied above the Fog Height. This simulates a layer of cloud.

• below – Fog is only applied below the Fog Height. This simulates ground fog.

The cutoff point for fog, in world units, when Fog Height Mode is set to above or below.

A gradual falloff for fog so the transition between fog and no fog is not as sharp. This is in world units, and affects the fogged area so that at Fog Height there will be no fog. For example, in above mode, the fog density will gradually increase from zero at Fog Height, to Fog Density at Fog Height + Fog Height Falloff.

For the Volumetric fog types, this range defines where the fog is lit, also in world units from the camera. Outside this range no fog effect occurs, so it should tightly bound the lights with Fog Scattering. Making this too large will make the fog look blocky.

• Low Volumetric – Small volume used for lighting, very fast.

• Medium Volumetric – Medium sized volume used for lighting, balanced between speed and quality.

• High Volumetric – Large volume used for lighting, high quality.

The default light intensity for all lights that do not have the gl_fogintensity property on them. By default this is 1 (all lights contribute to the lit fog). This can be set to zero so that only lights with gl_fogintensity contribute to the lighting.

The first value controls the intensity of the lit fog when the light ray is parallel to the viewing direction. The second controls the intensity when the light ray is perpendicular to the viewing direction. Bright light blooms can be reduced by reducing the first value while still keeping god rays visible. This setting only affects Volumetric Fog, and can be overridden per-light with gl_fogscattering property on the light node.

Place this property on a light to control how much it illuminates lit volumetric fog. By default all lights have a intensity factor defined by the Fog Intensity display option (or property above). Setting this to zero or less will remove the light from volumetric lighting.

Place this property on a light to control light scattering on volumetric fog. The first value controls the intensity of the lit fog when the light ray is parallel to the viewing direction. The second controls the intensity when the light ray is perpendicular to the viewing direction. Bright light blooms can be reduced by reducing the first value while still keeping god rays visible.